SoAColumn.h

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// Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
#ifndef ATHDEVICEUTILS_SOACOLUMN_H
#define ATHDEVICEUTILS_SOACOLUMN_H
 
// System include(s).
#include <concepts>
#include <cstddef>
#include <string_view>
 
namespace AthDevice {

template <std::size_t INDEX>
struct SoAColumn {
  std::string_view name;
  static constexpr std::size_t index = INDEX;
};
 
namespace Concepts {

template <typename T>
concept SoAColumn = requires {
  { T::name } -> std::convertible_to<std::string_view>;
  { T::index } -> std::convertible_to<std::size_t>;
};
 
}  // namespace Concepts
 
}  // namespace AthDevice
 
// Check that the type and concept are correctly defined.
static_assert(AthDevice::Concepts::SoAColumn<AthDevice::SoAColumn<0>>,
              "Implementation error in AthDevice::Concepts::SoAColumn.");
 
#endif  // ATHDEVICEUTILS_SOACOLUMN_H